Defensive publication

ABSTRACT

A DIELECTRIC OF A FLEXIBLE FILM BASE OF A POLYESTER OF A POLYAMIDE COATED ON AT LEAST ONE SIDE WITH A POLYEPOXIDE CURED WITH AN ANHYDRIDE AND OPTIONALLY CONTAINING AN INORGANIC FILLER SUCH AS TALC. THIS DIELECTRIC IS PARTICULARLY USEFUL FOR HIGH TEMPERATURE APPLICATIONS IN INSULATING COILS IN ELECTRIC MOTORS, E.G. SLOT LINERS AND PHASE LINERS, AND FOR USE AS A BASE IN PREPARING PRINTED CIRCUITS.

DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at therequest 01. the applicant or owner in accordance with the Notice of Dec.16, 1969, 869 0.G. 687. The abstracts of Defensive Publicationapplications are identified by distinctly numbered series and arearranged chronologically. The heading of each abstract indicates thenumber of pages of specification. including claims and sheets ofdrawings contained in the application as originally filed. The files ofthese applications are available to the public for inspection andreproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to themerits of alleged invention. The Patent Ofiice makes no assertion as tothe novelty of the disclosed subject matter.

PUBLISHED SEPTEMBER 11, 1973 T914,003 FLEXIBLE, EPOXY-COATED DIELECTRICRichard Winthrop Bradt, Jr., Richmond, Va., assignor to :3). du Pont deNemours and Company, Wilmington,

Continuation of application Ser. No. 76,976, Sept. 30, 1970. Thisapplication May 22, 1972, Ser. No. 255,698 Int. Cl. B32b 27/08 US. Cl.117138.8 F No Drawing. 10 Pages Specification A dielectric of a flexiblefilm base of a polyester or a polyamide coated on at least one side witha polyepoxide cured with an anhydride and optionally containing aninorganic filler such as talc. This dielectric is particularly usefulfor high temperature applications in insulating coils in electricmotors, e.g. slot liners and phase liners, and for use as a base inpreparing printed circuits.

